/*!	 filecontainerzip.h
**	 FileContainerZip
**
**	......... ... 2013 Ivan Mahonin
**
**	This package is free software; you can redistribute it and/or
**	modify it under the terms of the GNU General Public License as
**	published by the Free Software Foundation; either version 2 of
**	the License, or (at your option) any later version.
**
**	This package is distributed in the hope that it will be useful,
**	but WITHOUT ANY WARRANTY; without even the implied warranty of
**	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
**	General Public License for more details.
**
*/

#ifndef __SYNFIG_FILECONTAINERZIP_H
#define __SYNFIG_FILECONTAINERZIP_H

#include <map>
#include <ctime>
#include "filecontainer.h"

namespace synfig
{

class FileContainerZip: public FileContainer
{
public:
    typedef etl::handle<FileContainerZip> Handle;

    class WholeZipReadStream : public FileSystem::ReadStream
    {
    public:
        typedef etl::handle<WholeZipReadStream> Handle;
    protected:
        friend class FileContainerZip;
        WholeZipReadStream(FileSystem::Handle file_system);
    public:
        virtual ~WholeZipReadStream();
        virtual size_t read(void *buffer, size_t size);
    };

    typedef long long int file_size_t;

    struct HistoryRecord {
        file_size_t prev_storage_size;
        file_size_t storage_size;
        inline explicit HistoryRecord(file_size_t prev_storage_size = 0, file_size_t storage_size = 0):
            prev_storage_size(prev_storage_size), storage_size(storage_size) { }
    };

private:
    struct FileInfo {
        String name;
        bool is_directory;
        bool directory_saved;
        file_size_t size;
        file_size_t header_offset;
        unsigned int compression;
        unsigned int crc32;
        time_t time;

        String name_part_directory;
        String name_part_localname;

        void split_name();

        inline FileInfo():
            is_directory(false), directory_saved(false),
            size(0), header_offset(0), compression(0), crc32(0), time(0) { }
    };

    typedef std::map< String, FileInfo > FileMap;

    FILE *storage_file_;
    FileMap files_;
    file_size_t prev_storage_size_;
    bool file_reading_whole_container_;
    bool file_reading_;
    bool file_writing_;
    FileMap::iterator file_;
    file_size_t file_processed_size_;
    bool changed_;

    static unsigned int crc32(unsigned int previous_crc, const void *buffer, size_t size);
    static String encode_history(const HistoryRecord &history_record);
    static HistoryRecord decode_history(const String &comment);
    static void read_history(std::list<HistoryRecord> &list, FILE *f, file_size_t size);

public:
    FileContainerZip();
    virtual ~FileContainerZip();

    virtual bool create(const String &container_filename);
    virtual bool open(const String &container_filename);
    bool open_from_history(const String &container_filename, file_size_t truncate_storage_size = 0);
    virtual void close();
    virtual bool is_opened();
    bool save();

    static std::list<HistoryRecord> read_history(const String &container_filename);

    virtual bool is_file(const String &filename);
    virtual bool is_directory(const String &filename);

    bool directory_check_name(const String &dirname);
    virtual bool directory_create(const String &dirname);
    virtual bool directory_scan(const String &dirname, FileList &out_files);

    virtual bool file_remove(const String &filename);

    bool file_check_name(const String &filename);
    virtual bool file_open_read_whole_container();
    virtual bool file_open_read(const String &filename);
    virtual bool file_open_write(const String &filename);
    virtual void file_close();

    virtual bool file_is_opened_for_read();
    virtual bool file_is_opened_for_write();

    virtual size_t file_read(void *buffer, size_t size);
    virtual size_t file_write(const void *buffer, size_t size);

    virtual FileSystem::ReadStream::Handle get_read_stream(const String &filename);
};

}

#endif